package com.lagou.edu.interceptor;

import com.lagou.edu.pojo.User;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * @author Kirito
 * @description:
 * @date 2020/04/12
 */
public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //获取session
        HttpSession session = request.getSession();
        User user = (User) session.getAttribute("user");
        //判断session中是否有用户数据，如果有，则返回true，继续向下执行
        if (user != null) {
            return true;
        }
        //不符合条件的给出提示信息，并转发到登录页面
        request.setAttribute("message", "您还没有登录，请先登录！");
        request.getRequestDispatcher("/WEB-INF/jsp/login.jsp").forward(request, response);
        return false;
    }
}
